MLA

Merchant's Commonplace Book. 0AD. https://collections.library.yale.edu/catalog/10269817.

APA, 6th edition

Merchant's commonplace book. (0 C.E.). [Early works to 1800, Commonplace books Italy To 1400, Manuscripts, Medieval Italy 14th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10269817.